Coal cutting machine



Nov. 7, 1933- w. c. ROBBINS COAL CUTTING MACHINE 1932 3 Sheets-Sheet 1 Filed Aug. 11,

Invenlor Robbins Mun.

f1 lldme y Inven [or w al W. C. ROBBINS COAL CUTTING MACHINE Filed Aug. 11, 1932 3 Sheets-Sheet 2 Nov. 7, 1933.

.1 A... l m n" n" a Nov. 7, 1933. w. c. ROBBINS COAL CUTTING MACHINE Filed Aug. 11, 1932 3 Sheets-Sheet 3 W. C Robbins Patented Nov. 7, 1933 STATES PATENT 'GFFICE 1 Claim.

The present invention relates to new and useful improvements in coal cutting machines for use in mines and has for its primary object to provide, in a manner as hereinafter set forth, a machine 'of this character which will be portable and which may be moved, erected and operated by a comparatively small number of men.

Other objects of the invention are to provide a coal cutting machine of the aforementioned character which will be-simple in construction, strong,'durable, eflicient and reliable in operation, light in weight and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference I designate corresponding parts throughout the through an inner portion of the machine.

Figure 3 is a view in horizontal longitudinal section, taken substantially on the line 3-3 of Figure 1.

Figure 4 is a detail view in vertical section, showing the upper portion of the supporting structure.

Figure 5 is a detail view in vertical section, showing the lower portion of the supporting structure.

Figure 6 is a detail View in longitudinal section through a portion of the frame, showing a portion of the endless chain with a bit mounted thereon.

Figure 7 is a detail View in longitudinal section through one of the bit supporting elements of the chain.

Figure 8 is a transverse sectional View through a portion of the bit chain and the supporting frame in which said chain runs.

Figure 9 is a detail view in perspective of one of the bit supporting elements of the chain.

Figure 10 is a detail view in transverse section through one end portion of the housing, taken substantially on the line l0--10 of Figure 3.

Figure 11 is a detail view in perspective of a bit.

Figure 12 is a view in longitudinal section through the outer end portion of the machine.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention housing 1 which is open at its ends. Rigidly secured in one end portion of the housing 1 and projecting forwardly therefrom is a metallic frame 2 of substantially skeleton form having opposed, integral flanges 3 on its longitudinal sides and vits rounded free end portion defining a continuous channel in which an endless chain designated generally by the reference numeral 4 is operable; The chain 4 travels over a pulley 5 which is provided therefor in the outer end portion of the 5 frame 2, said pulley 5 being journaled. on ta shaft 6. g

The-inner end of the chain 4 is trained'around a longitudinally adjustable pulley '7 which is journaled on a shaft 8. The shaft 8 is operable in longitudinal slots 9 which are provided therefor in opposed walls of the housing 1, said shaft being threadedly mounted on adjusting screws 10 which are journaled in bearings 11 which are provided for said screws on the housing 1. As will be apparent, the adjustability of the pulley '7 permits the chain 4 to be tightened as desired.

Also rotatably mounted in the housing 1 is a sprocket gear 12 which is operatively engaged ,7 with the chain 4, as illustrated to advantage in Figure 2 of the drawings. The sprocket gear 12 is fixed on a shaft 13 which projects from one side of the housing 1. A plate 14 is mounted for rotary adjustment on said one side of the housing 1, said plate being journ'aled on the shaft 13. The plate 35 14 is secured in adjusted position on the housing 1 through the medium of a bolt 15 which is threadedly engaged in said housing. The plate 14 s provided with an arcuate series of openings 16 in which the securing bolt 15 is selectively insert able.

Extending rearwardly from the plate 14 beyond the housing 1 is a pair of spaced, parallel arms 17 upon which an electric motor 18 is mounted. The I, reference numeral 19 designates handles projecting from the motor 18 for manipulating the machine. The reference numeral 29 designates the motor shaft which is operatively connected to the sprocket gear shaft 13 by a gear assembly 21 in a casing 22 which is mounted on the plate 14. The adjustability of the motor 18 and the driving mechanism for the chain 14 permits the use of the machine in what are ordinarily considered inaccessible places.

The reference numeral 23 designates an adjustable supporting post upon which the housing 1 is adjustably mounted. The post 23 includes a tubular section 24 which telescopically receixes another section 25. The section 25 is secured in adjusted position in the section 24 through the its medium of a transverse pin 26 which is engageable selectively in openings 27 which are pro vided therefor in said section 24. A pin 28 projects from the section and is operable longitudinally in slots 29 which are provided therefor in the section 24 for preventing relative rotary movement between said sections. Opposed lugs 30 are provided on the housing 1 and are slidably engaged with opposite sides of the post 23.

The reference numeral 31 designates a drum which is mounted on the housing 1. An operating shaft 32 is fixed to the drum 31 and is provided with an actuating wheel 33 on one end. The reference numeral 34 designates an adjustable cable having one end portion wound on the drum 31. The cable 34 is trained over a pulley 35 which is journaled in the free end portion of the section 24 of the post 23 and has its other end anchored to the housing 1. It will thus be seen that by actuating the drum 31, the housing 1 may be adjusted on the post 23.

The endless chain 4 comprises a plurality of metallic blocks 36 which are connected together by links 37. Ribs 38 are provided integrally on the blocks 36 and travel on the flanges 3 of the frame 2. Pins 39 pivotally connect the links 37 to the blocks 36, said pins 39 being releasably locked in the blocks by screws 40. The blocks 36 are provided'with bores 41 for adjustably receiving bits 42 which may be of any suitable length. The bits 42 are secured in adjusted position through the medium of set screws 43.

Aligned openings 44 are provided in opposed walls of the housing 1 to facilitate removal of; the pins 39 of the endless chain 4. Toy accomplish this, the screws 40 are first removed and the pins 39 which are to be removed are brought into alignment with the openings 44 after which said pins may be driven out through the medium of a suitable punch or other tool which is inserted through one of said openings 44.

In use, the electric motor 18 drives the endless chain 4 carrying the bits 42 in a manner which is thought to be obvious. It will be seen that the mounting of the motor and the driving mechanism on the housing 1 is such that said motor may be swung to any desired position relative to said housing as suggested in Figure 1 of the drawings. If desired, the electric motor may be removed and a suitable hand driving means substituted therefor.

It is believed that the many advantages of a coal cutting machine constructed in accordance with the present invention will be readily understood, and although the preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

A coal cutting machine comprising a housing,

an elongated frame projecting from the housing,

ing provided with openings to be aligned with said pins to permit the insertion and removal of said pins.

WILLIAM CLARENCE ROBBINS, 

